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Your problem is that you MUST NOT not close your
polygon with the first vertex (12,0,0). Define your poly as
12,0,0
12,8,0
8,8,0
8,4,0
4,4,0
4,8,0
0,8,0
0,0,0
(Trianle==3 vertices, not 4)
Lionel
----- Original Message -----
Sent: Friday, December 12, 2003 1:13
PM
Subject: Re: [Nel] How to use
NLMISC::CPolygon::toConvexPolygons function
Hi
My concave polygon is
12,0,0
12,8,0
8,8,0
8,4,0
4,4,0
4,8,0
0,8,0
0,0,0
12,0,0
and the result in list<CPolygon> convexPolygons , i.e list of
convex polygons into which original polygon is broken , that i am getting is
--
12,8,0
8,8,0
8,4,0
4,4,0
4,8,0
0,8,0
0,0,0
which are not suitable. Please kindly tell how to get proper results.This
is what i am doing :--
void main()
{
CMatrix m1;
CPolygon poly1;
poly1.Vertices.push_back(CVector(12,0,0));
poly1.Vertices.push_back(CVector(12,8,0));
poly1.Vertices.push_back(CVector(8,8,0));
poly1.Vertices.push_back(CVector(8,4,0));
poly1.Vertices.push_back(CVector(4,4,0));
poly1.Vertices.push_back(CVector(4,8,0));
poly1.Vertices.push_back(CVector(0,8,0));
poly1.Vertices.push_back(CVector(0,0,0));
poly1.Vertices.push_back(CVector(12,0,0));
list<CPolygon> convexPolygons;
poly1.toConvexPolygons(convexPolygons,m1)<<endl;
for (list<CPolygon>::iterator i =
convexPolygons.begin() ;
i != convexPolygons.end(); ++i){
vector<CVector> t1 =
i->Vertices;
for(int j = 0;j<t1.size();++j)
cout<<t1[j].x<<','<<t1[j].y<<','<<t1[j].z<<endl;
cout<<endl;
}
}
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